A:led
B:leading
C:to lead
D:had led
He looks happy because he loves ____ (swim).
如图,在△ABC中,已知DE∥BC,AEEC=23,则△ADE与△ABC的面积比为 ____.
从海南某地(20°N,110°E)起航的渔政船,向正在(10°N,117°E)附近海域的渔船靠近.渔政船选择的前进方向应该大致是( )
绿色开花植物的卵细胞与精子结合发生在( )